Abstract
Heat stored in hot rocks is estimated of Kurobe-Sennindani and Esan in the central and the northern Japan, respectively. Estimate is unsystematic and its success is rather lucky. For Kurobe-Sennindani the measurements were helpful of wall temperature, heat flow and heat conductivity on the rockwalls of the railway and the waterway tunnels penetrating through the central part of the hot rock. On the other hand, for Esan the geomagnetic survey and its analytical results by Nishida et al. (1974) provided the basic data to estimate heat stored in the hot rock. Heat discharges from the both hot rocks are evaluated as well as stored heat. The results show that stored heat and discharged heat of the both hot rocks are nearly comparative, 3 to 7×1015 cal and 2 to 6×1O5 cal/sec, respectively.
